Food fans create online maps of great taco trucks, Chinese restaurants, and pizza spots, persuading others to submit their treasured information. Mapping introduces people to small businesses that they might not otherwise find and helps them see the good in their own community, one mapper says. For taco trucks, click 'See also.'

As demographics change and number of immigrants increases, parks service employees get crash course on food traditions of ethnic holidays - and look to educate foreign-born guests that permits are often required, litter pickup is encouraged and alcohol verboten.